Nice level of polish to this one. Unreal games tend to look really professional. But yeah, just having to pick up identical gems and see whether they kill you or not isn't a very fun mechanic. (A memory game where the whole goal is to remember which is which would be fine, but you don't want to combine that with jumping puzzles. It's frustrating to get all the way through a tricky jump and then find out that the gem is fake!)